This series introduces and makes use of a new scatterlist function named
sg_nents_for_len. The purpose of this function is determine the number
of scatterlist entries required to satisify a specified length. The
resulting count can be used as input to the dma_map_sg function to map
only the entries needed.
This function is needed for cases where a supplied scatterlist has not
marked the last filled sg entry as the end of the scatterlist. In these
cases, the sg_nents function count includes sg entries that may not have
been filled in. When using this value in a dma_map_sg call it can result
in errors/bugs being generated.
The following patches are included in this series:
- Introduce the sg_nents_for_len function
- Update the ccp driver to use the sg_nents_for_len function
This patch series is based on cryptodev-2.6.
---
Tom Lendacky (2):
scatterlist: introduce sg_nents_for_len
crypto: ccp - Protect against poorly marked end of sg list
drivers/crypto/ccp/ccp-ops.c | 7 +++++--
include/linux/scatterlist.h | 1 +
lib/scatterlist.c | 32 ++++++++++++++++++++++++++++++++
3 files changed, 38 insertions(+), 2 deletions(-)
--
Tom Lendacky
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