5.4-stable review patch. If anyone has any objections, please let me know.
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From: Kinsey Moore kinsey.moore@oarcorp.com
commit fe051552f5078fa02d593847529a3884305a6ffe upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/jffs2/compr_rtime.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/fs/jffs2/compr_rtime.c +++ b/fs/jffs2/compr_rtime.c @@ -95,6 +95,9 @@ static int jffs2_rtime_decompress(unsign
positions[value]=outpos; if (repeat) { + if ((outpos + repeat) >= destlen) { + return 1; + } if (backoffs + repeat >= outpos) { while(repeat) { cpage_out[outpos++] = cpage_out[backoffs++];