drivers/net/arcnet/com20020.c:74:7: warning: performing pointer arithmetic on a null pointer has undefined behavior

From: kernel test robot
Date: Wed Aug 09 2023 - 19:17:15 EST

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Hi Maciej,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: cacc6e22932f373a91d7be55a9b992dc77f4c59b
commit: 9cc205e3c17d5716da7ebb7fa0c985555e95d009 RISC-V: Make port I/O string accessors actually work
date: 10 months ago
config: riscv-randconfig-r012-20230810 (https://download.01.org/0day-ci/archive/20230810/202308100724.x7jQq1ty-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.7 (https://github.com/llvm/llvm-project.git 8dfdcc7b7bf66834a761bd8de445840ef68e4d1a)
reproduce: (https://download.01.org/0day-ci/archive/20230810/202308100724.x7jQq1ty-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308100724.x7jQq1ty-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

In file included from include/linux/highmem.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:751:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
insw(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:105:53: note: expanded from macro 'insw'
#define insw(addr, buffer, count) __insw(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/net/arcnet/com20020.c:37:
In file included from include/linux/netdevice.h:38:
In file included from include/net/net_namespace.h:43:
In file included from include/linux/skbuff.h:17:
In file included from include/linux/bvec.h:10:
In file included from include/linux/highmem.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:759:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
insl(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:106:53: note: expanded from macro 'insl'
#define insl(addr, buffer, count) __insl(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/net/arcnet/com20020.c:37:
In file included from include/linux/netdevice.h:38:
In file included from include/net/net_namespace.h:43:
In file included from include/linux/skbuff.h:17:
In file included from include/linux/bvec.h:10:
In file included from include/linux/highmem.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:768:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
outsb(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:118:55: note: expanded from macro 'outsb'
#define outsb(addr, buffer, count) __outsb(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/net/arcnet/com20020.c:37:
In file included from include/linux/netdevice.h:38:
In file included from include/net/net_namespace.h:43:
In file included from include/linux/skbuff.h:17:
In file included from include/linux/bvec.h:10:
In file included from include/linux/highmem.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:777:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
outsw(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:119:55: note: expanded from macro 'outsw'
#define outsw(addr, buffer, count) __outsw(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/net/arcnet/com20020.c:37:
In file included from include/linux/netdevice.h:38:
In file included from include/net/net_namespace.h:43:
In file included from include/linux/skbuff.h:17:
In file included from include/linux/bvec.h:10:
In file included from include/linux/highmem.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:786:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
outsl(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:120:55: note: expanded from macro 'outsl'
#define outsl(addr, buffer, count) __outsl(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/net/arcnet/com20020.c:37:
In file included from include/linux/netdevice.h:38:
In file included from include/net/net_namespace.h:43:
In file included from include/linux/skbuff.h:17:
In file included from include/linux/bvec.h:10:
In file included from include/linux/highmem.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:1134:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
~~~~~~~~~~ ^
>> drivers/net/arcnet/com20020.c:74:7: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
arcnet_insb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/arcnet/arcdevice.h:389:2: note: expanded from macro 'arcnet_insb'
insb((addr) + BUS_ALIGN * (offset), buffer, count)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:104:53: note: expanded from macro 'insb'
#define insb(addr, buffer, count) __insb(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
drivers/net/arcnet/arcdevice.h:103:3: note: expanded from macro 'TIME'
call; \
^~~~
>> drivers/net/arcnet/com20020.c:74:7: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
arcnet_insb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/arcnet/arcdevice.h:389:2: note: expanded from macro 'arcnet_insb'
insb((addr) + BUS_ALIGN * (offset), buffer, count)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:104:53: note: expanded from macro 'insb'
#define insb(addr, buffer, count) __insb(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
drivers/net/arcnet/arcdevice.h:110:3: note: expanded from macro 'TIME'
call; \
^~~~
drivers/net/arcnet/com20020.c:88:7: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
arcnet_outsb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/arcnet/arcdevice.h:391:2: note: expanded from macro 'arcnet_outsb'
outsb((addr) + BUS_ALIGN * (offset), buffer, count)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:118:55: note: expanded from macro 'outsb'
#define outsb(addr, buffer, count) __outsb(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
drivers/net/arcnet/arcdevice.h:103:3: note: expanded from macro 'TIME'
call; \
^~~~
drivers/net/arcnet/com20020.c:88:7: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
arcnet_outsb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/arcnet/arcdevice.h:391:2: note: expanded from macro 'arcnet_outsb'
outsb((addr) + BUS_ALIGN * (offset), buffer, count)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:118:55: note: expanded from macro 'outsb'
#define outsb(addr, buffer, count) __outsb(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
drivers/net/arcnet/arcdevice.h:110:3: note: expanded from macro 'TIME'
call; \
^~~~
17 warnings generated.

vim +74 drivers/net/arcnet/com20020.c

^1da177e4c3f41 Linus Torvalds 2005-04-16 61
^1da177e4c3f41 Linus Torvalds 2005-04-16 62 static void com20020_copy_from_card(struct net_device *dev, int bufnum,
^1da177e4c3f41 Linus Torvalds 2005-04-16 63 int offset, void *buf, int count)
^1da177e4c3f41 Linus Torvalds 2005-04-16 64 {
^1da177e4c3f41 Linus Torvalds 2005-04-16 65 int ioaddr = dev->base_addr, ofs = 512 * bufnum + offset;
^1da177e4c3f41 Linus Torvalds 2005-04-16 66
^1da177e4c3f41 Linus Torvalds 2005-04-16 67 /* set up the address register */
0fec65130b9f11 Joe Perches 2015-05-05 68 arcnet_outb((ofs >> 8) | RDDATAflag | AUTOINCflag,
0fec65130b9f11 Joe Perches 2015-05-05 69 ioaddr, COM20020_REG_W_ADDR_HI);
0fec65130b9f11 Joe Perches 2015-05-05 70 arcnet_outb(ofs & 0xff, ioaddr, COM20020_REG_W_ADDR_LO);
^1da177e4c3f41 Linus Torvalds 2005-04-16 71
^1da177e4c3f41 Linus Torvalds 2005-04-16 72 /* copy the data */
0fec65130b9f11 Joe Perches 2015-05-05 73 TIME(dev, "insb", count,
0fec65130b9f11 Joe Perches 2015-05-05 @74 arcnet_insb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count));
^1da177e4c3f41 Linus Torvalds 2005-04-16 75 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 76

:::::: The code at line 74 was first introduced by commit
:::::: 0fec65130b9f11a73d74f47025491f97f82ba070 arcnet: com20020: Use arcnet_<I/O> routines

:::::: TO: Joe Perches <joe@xxxxxxxxxxx>
:::::: CC: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>

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Next message: Miguel Ojeda: "Re: [PATCH] MAINTAINERS: add Andreas Hindborg as Rust reviewer"
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