diff options
author | Souptick Joarder <jrdr.linux@gmail.com> | 2020-10-15 20:13:15 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-16 11:11:22 -0700 |
commit | fa63f083b3492b5ed5332b8d7c90b03b5ef24a1d (patch) | |
tree | 2200347fd904d625329ee7f170b670cdf6393293 /drivers/rapidio/devices/tsi721.h | |
parent | 64ead5201e757159d1d83a5e0752090c2ab3319f (diff) |
rapidio: fix error handling path
rio_dma_transfer() attempts to clamp the return value of
pin_user_pages_fast() to be >= 0. However, the attempt fails because
nr_pages is overridden a few lines later, and restored to the undesirable
-ERRNO value.
The return value is ultimately stored in nr_pages, which in turn is passed
to unpin_user_pages(), which expects nr_pages >= 0, else, disaster.
Fix this by fixing the nesting of the assignment to nr_pages: nr_pages
should be clamped to zero if pin_user_pages_fast() returns -ERRNO, or set
to the return value of pin_user_pages_fast(), otherwise.
[jhubbard@nvidia.com: new changelog]
Fixes: e8de370188d09 ("rapidio: add mport char device driver")
Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Alexandre Bounine <alex.bou9@gmail.com>
Cc: Gustavo A. R. Silva <gustavoars@kernel.org>
Cc: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lkml.kernel.org/r/1600227737-20785-1-git-send-email-jrdr.linux@gmail.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rapidio/devices/tsi721.h')
0 files changed, 0 insertions, 0 deletions