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ide: don't call memcpy with the same source and destination 

The parisc architecture recently reimplemented the memcpy function and
their reimplementation crashed when source and destination overlapped.

The crash happened in the function ide_complete_cmd where memcpy is called
with the same source and destination pointer. According to the C
specification, memcpy behavior is undefined if the source and destination
range overlaps. This patches fixes the undefined behavior.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mikulas Patocka 2017-04-14 14:35:33 -04:00 committed by David S. Miller
parent 1a1df90ae1
commit acfead32f3
1 changed files with 1 additions and 1 deletions
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2
drivers/ide/ide-io.c
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@ -107,7 +107,7 @@ void ide_complete_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 stat, u8 err)
if (cmd->tf_flags & IDE_TFLAG_DYN)
kfree(orig_cmd);
else
else if (cmd != orig_cmd)
memcpy(orig_cmd, cmd, sizeof(*cmd));
}
}