Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 31decdcd authored by Stephan Mueller's avatar Stephan Mueller Committed by Greg Kroah-Hartman
Browse files

lib/mpi: kunmap after finishing accessing buffer 



commit dea3eb8b452e36cf2dd572b0a797915ccf452ae6 upstream.

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: 4816c940 ("lib/mpi: Fix SG miter leak")
Signed-off-by: default avatarStephan Mueller <smueller@chronox.de>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9e2788ce

lib/mpi/mpicoder.c

+3 −1
Original line number Diff line number Diff line
@@ -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)