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authorColin Ian King <colin.king@canonical.com>2017-12-22 18:51:50 +0100
committerJens Wiklander <jens.wiklander@linaro.org>2017-12-28 22:20:10 +0100
commitc94f31b526fe658c25dd2d07c90486a85437f01c (patch)
tree7742a74048136041c64b869d4ea0aae6650a51b8 /drivers/tee
parenttee: shm: make function __tee_shm_alloc static (diff)
downloadlinux-c94f31b526fe658c25dd2d07c90486a85437f01c.tar.xz
linux-c94f31b526fe658c25dd2d07c90486a85437f01c.zip
tee: shm: don't put_page on null shm->pages
In the case that shm->pages fails to allocate, the current exit error path will try to put_page on a null shm->pages and cause a null pointer dereference when accessing shm->pages[n]. Fix this by only performing the put_page and kfree on shm->pages if it is not null. Detected by CoverityScan, CID#1463283 ("Dereference after null check") Fixes: 033ddf12bcf5 ("tee: add register user memory") Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Diffstat (limited to 'drivers/tee')
-rw-r--r--drivers/tee/tee_shm.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c
index 511eb298949b..6f36da9ee412 100644
--- a/drivers/tee/tee_shm.c
+++ b/drivers/tee/tee_shm.c
@@ -335,9 +335,11 @@ err:
idr_remove(&teedev->idr, shm->id);
mutex_unlock(&teedev->mutex);
}
- for (n = 0; n < shm->num_pages; n++)
- put_page(shm->pages[n]);
- kfree(shm->pages);
+ if (shm->pages) {
+ for (n = 0; n < shm->num_pages; n++)
+ put_page(shm->pages[n]);
+ kfree(shm->pages);
+ }
}
kfree(shm);
teedev_ctx_put(ctx);