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

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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));
}
}