diff options
| author |   Stephan Mueller <smueller@chronox.de> | 2017-08-10 08:06:18 +0200 |
|---|---|---|
| committer |   Herbert Xu <herbert@gondor.apana.org.au> | 2017-08-22 14:45:01 +0800 |
| commit | dea3eb8b452e36cf2dd572b0a797915ccf452ae6 (patch) | |
| tree | 8d4fe3412cd76e3bcd7959aa635e71ab80b622f8 /lib | |
| parent | crypto: x86/sha1 - Fix reads beyond the number of blocks passed (diff) | |
| download | linux-dev-dea3eb8b452e36cf2dd572b0a797915ccf452ae6.tar.xz linux-dev-dea3eb8b452e36cf2dd572b0a797915ccf452ae6.zip | |
lib/mpi: kunmap after finishing accessing buffer
Using sg_miter_start and sg_miter_next, the buffer of an SG is kmap'ed
to *buff. The current code calls sg_miter_stop (and thus kunmap) on the
SG entry before the last access of *buff.
The patch moves the sg_miter_stop call after the last access to *buff to
ensure that the memory pointed to by *buff is still mapped.
Fixes: 4816c9406430 ("lib/mpi: Fix SG miter leak")
Cc: <stable@vger.kernel.org>
Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/mpi/mpicoder.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/mpi/mpicoder.c b/lib/mpi/mpicoder.c index 5a0f75a3bf01..eead4b339466 100644 --- a/lib/mpi/mpicoder.c +++ b/lib/mpi/mpicoder.c @@ -364,11 +364,11 @@ MPI mpi_read_raw_from_sgl(struct scatterlist *sgl, unsigned int nbytes) } miter.consumed = lzeros; - sg_miter_stop(&miter); nbytes -= lzeros; nbits = nbytes * 8; if (nbits > MAX_EXTERN_MPI_BITS) { + sg_miter_stop(&miter); pr_info("MPI: mpi too large (%u bits)\n", nbits); return NULL; } @@ -376,6 +376,8 @@ MPI mpi_read_raw_from_sgl(struct scatterlist *sgl, unsigned int nbytes) if (nbytes > 0) nbits -= count_leading_zeros(*buff) - (BITS_PER_LONG - 8); + sg_miter_stop(&miter); + nlimbs = DIV_ROUND_UP(nbytes, BYTES_PER_MPI_LIMB); val = mpi_alloc(nlimbs); if (!val) |