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jffs2: Prevent rtime decompress memory corruption

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The rtime decompression routine does not fully check bounds during the
entirety of the decompression pass and can corrupt memory outside the
decompression buffer if the compressed data is corrupted. This adds the
required check to prevent this failure mode.

Cc: stable@vger.kernel.org
Signed-off-by: Kinsey Moore <kinsey.moore@oarcorp.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Kinsey Moore 2024-07-23 15:58:05 -05:00 committed by Richard Weinberger
parent 7c8e694bdb
commit fe051552f5
1 changed files with 3 additions and 0 deletions
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fs/jffs2/compr_rtime.c
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@ -95,6 +95,9 @@ static int jffs2_rtime_decompress(unsigned char *data_in,
positions[value]=outpos;
if (repeat) {
if ((outpos + repeat) >= destlen) {
return 1;
}
if (backoffs + repeat >= outpos) {
while(repeat) {
cpage_out[outpos++] = cpage_out[backoffs++];