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lib/lzo/lzo1x_compress.c: fix alignment bug in lzo-rle 

Fix an unaligned access which breaks on platforms where this is not
permitted (e.g., Sparc).

Link: http://lkml.kernel.org/r/20190912145502.35229-1-dave.rodgman@arm.com
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
Cc: Dave Rodgman <dave.rodgman@arm.com>
Cc: Markus F.X.J. Oberhumer <markus@oberhumer.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dave Rodgman 2019-09-25 16:48:24 -07:00 committed by Linus Torvalds
parent 984035ad7b
commit 09b35b4192
1 changed files with 8 additions and 6 deletions
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14
lib/lzo/lzo1x_compress.c
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@ -83,17 +83,19 @@ next:
ALIGN((uintptr_t)ir, 4)) &&
(ir < limit) && (*ir == 0))
ir++;
for (; (ir + 4) <= limit; ir += 4) {
dv = *((u32 *)ir);
if (dv) {
if (IS_ALIGNED((uintptr_t)ir, 4)) {
for (; (ir + 4) <= limit; ir += 4) {
dv = *((u32 *)ir);
if (dv) {
# if defined(__LITTLE_ENDIAN)
ir += __builtin_ctz(dv) >> 3;
ir += __builtin_ctz(dv) >> 3;
# elif defined(__BIG_ENDIAN)
ir += __builtin_clz(dv) >> 3;
ir += __builtin_clz(dv) >> 3;
# else
# error "missing endian definition"
# endif
break;
break;
}
}
}
#endif