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scsi: aacraid: Replace one-element array with flexible-array member

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There is a regular need in the kernel to provide a way to declare having a
dynamically sized set of trailing elements in a structure. Kernel code
should always use “flexible array members”[1] for these cases. The older
style of one-element or zero-length arrays should no longer be used[2].

Refactor the code according to the use of a flexible-array member in struct
aac_raw_io2 instead of one-element array, and use the struct_size() helper.

Also, this helps with the ongoing efforts to enable -Warray-bounds by
fixing the following warnings:

drivers/scsi/aacraid/aachba.c: In function ‘aac_build_sgraw2’:
drivers/scsi/aacraid/aachba.c:3970:18: warning: array subscript 1 is above array bounds of ‘struct sge_ieee1212[1]’ [-Warray-bounds]
 3970 |     if (rio2->sge[j].length % (i*PAGE_SIZE)) {
      |         ~~~~~~~~~^~~
drivers/scsi/aacraid/aachba.c:3974:27: warning: array subscript 1 is above array bounds of ‘struct sge_ieee1212[1]’ [-Warray-bounds]
 3974 |     nseg_new += (rio2->sge[j].length / (i*PAGE_SIZE));
      |                  ~~~~~~~~~^~~
drivers/scsi/aacraid/aachba.c:4011:28: warning: array subscript 1 is above array bounds of ‘struct sge_ieee1212[1]’ [-Warray-bounds]
 4011 |   for (j = 0; j < rio2->sge[i].length / (pages * PAGE_SIZE); ++j) {
      |                   ~~~~~~~~~^~~
drivers/scsi/aacraid/aachba.c:4012:24: warning: array subscript 1 is above array bounds of ‘struct sge_ieee1212[1]’ [-Warray-bounds]
 4012 |    addr_low = rio2->sge[i].addrLow + j * pages * PAGE_SIZE;
      |               ~~~~~~~~~^~~
drivers/scsi/aacraid/aachba.c:4014:33: warning: array subscript 1 is above array bounds of ‘struct sge_ieee1212[1]’ [-Warray-bounds]
 4014 |    sge[pos].addrHigh = rio2->sge[i].addrHigh;
      |                        ~~~~~~~~~^~~
drivers/scsi/aacraid/aachba.c:4015:28: warning: array subscript 1 is above array bounds of ‘struct sge_ieee1212[1]’ [-Warray-bounds]
 4015 |    if (addr_low < rio2->sge[i].addrLow)
      |                   ~~~~~~~~~^~~

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.9/process/deprecated.html#zero-length-and-one-element-arrays

Link: https://github.com/KSPP/linux/issues/79
Link: https://github.com/KSPP/linux/issues/109
Link: https://lore.kernel.org/lkml/60414244.ur4%2FkI+fBF1ohKZs%25lkp@intel.com/
Link: https://lore.kernel.org/r/20210421185611.GA105224@embeddedor
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Build-tested-by: kernel test robot <lkp@intel.com>
This commit is contained in:
Gustavo A. R. Silva 2021-04-21 13:56:11 -05:00 committed by Martin K. Petersen
parent aef80fd1da
commit 39107e8577
2 changed files with 6 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/scsi/aacraid/aachba.c
View File

@ -1235,8 +1235,8 @@ static int aac_read_raw_io(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u3
if (ret < 0)
return ret;
command = ContainerRawIo2;
fibsize = sizeof(struct aac_raw_io2) +
((le32_to_cpu(readcmd2->sgeCnt)-1) * sizeof(struct sge_ieee1212));
fibsize = struct_size(readcmd2, sge,
le32_to_cpu(readcmd2->sgeCnt));
} else {
struct aac_raw_io *readcmd;
readcmd = (struct aac_raw_io *) fib_data(fib);
@ -1366,8 +1366,8 @@ static int aac_write_raw_io(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u
if (ret < 0)
return ret;
command = ContainerRawIo2;
fibsize = sizeof(struct aac_raw_io2) +
((le32_to_cpu(writecmd2->sgeCnt)-1) * sizeof(struct sge_ieee1212));
fibsize = struct_size(writecmd2, sge,
le32_to_cpu(writecmd2->sgeCnt));
} else {
struct aac_raw_io *writecmd;
writecmd = (struct aac_raw_io *) fib_data(fib);
@ -3998,7 +3998,7 @@ static int aac_convert_sgraw2(struct aac_raw_io2 *rio2, int pages, int nseg, int
if (aac_convert_sgl == 0)
return 0;
sge = kmalloc_array(nseg_new, sizeof(struct sge_ieee1212), GFP_ATOMIC);
sge = kmalloc_array(nseg_new, sizeof(*sge), GFP_ATOMIC);
if (sge == NULL)
return -ENOMEM;

2
drivers/scsi/aacraid/aacraid.h
View File

@ -1929,7 +1929,7 @@ struct aac_raw_io2 {
u8 bpComplete; /* reserved for F/W use */
u8 sgeFirstIndex; /* reserved for F/W use */
u8 unused[4];
struct sge_ieee1212 sge[1];
struct sge_ieee1212 sge[];
};
#define CT_FLUSH_CACHE 129