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lz4: add overrun checks to lz4_uncompress_unknownoutputsize()

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Jan points out that I forgot to make the needed fixes to the
lz4_uncompress_unknownoutputsize() function to mirror the changes done
in lz4_decompress() with regards to potential pointer overflows.

The only in-kernel user of this function is the zram code, which only
takes data from a valid compressed buffer that it made itself, so it's
not a big issue.  But due to external kernel modules using this
function, it's better to be safe here.

Reported-by: Jan Beulich <JBeulich@suse.com>
Cc: "Don A. Bailey" <donb@securitymouse.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2014-07-03 16:06:57 -07:00
parent ecca47ce82
commit 4a3a990451
1 changed files with 5 additions and 1 deletions
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6
lib/lz4/lz4_decompress.c
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@ -192,6 +192,8 @@ static int lz4_uncompress_unknownoutputsize(const char *source, char *dest,
int s = 255;
while ((ip < iend) && (s == 255)) {
s = *ip++;
if (unlikely(length > (size_t)(length + s)))
goto _output_error;
length += s;
}
}
@ -232,6 +234,8 @@ static int lz4_uncompress_unknownoutputsize(const char *source, char *dest,
if (length == ML_MASK) {
while (ip < iend) {
int s = *ip++;
if (unlikely(length > (size_t)(length + s)))
goto _output_error;
length += s;
if (s == 255)
continue;
@ -284,7 +288,7 @@ static int lz4_uncompress_unknownoutputsize(const char *source, char *dest,
/* write overflow error detected */
_output_error:
return (int) (-(((char *) ip) - source));
return -1;
}
int lz4_decompress(const unsigned char *src, size_t *src_len,