lisa/android_kernel_xiaomi_sm8350
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

lib/mpi: Fix buffer overrun when SG is too long

Browse Source 
[ Upstream commit 7361d1bc307b926cbca214ab67b641123c2d6357 ]

The helper mpi_read_raw_from_sgl sets the number of entries in
the SG list according to nbytes.  However, if the last entry
in the SG list contains more data than nbytes, then it may overrun
the buffer because it only allocates enough memory for nbytes.

Fixes: 2d4d1eea54 ("lib/mpi: Add mpi sgl helpers")
Reported-by: Roberto Sassu <roberto.sassu@huaweicloud.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Herbert Xu 2022-12-27 15:27:39 +01:00 committed by Greg Kroah-Hartman
parent b55ada30b5
commit 987b0ff1b9
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
lib/mpi/mpicoder.c
View File

@ -397,7 +397,8 @@ MPI mpi_read_raw_from_sgl(struct scatterlist *sgl, unsigned int nbytes)
while (sg_miter_next(&miter)) {
buff = miter.addr;
len = miter.length;
len = min_t(unsigned, miter.length, nbytes);
nbytes -= len;
for (x = 0; x < len; x++) {
a <<= 8;