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authorLiu ShuoX <shuox.liu@intel.com>2014-03-17 13:57:49 -0700
committerTony Luck <tony.luck@intel.com>2014-03-17 14:14:03 -0700
commitb0aa931fb84431394d995472d0af2a6c2b61064d (patch)
treedc51c08fc851d57745ebc79851a9622d7e8b4d15
parentaa9a4a1edfbd3d223af01db833da2f07850bc655 (diff)
downloadlinux-b0aa931fb84431394d995472d0af2a6c2b61064d.tar.bz2
pstore: Fix NULL pointer fault if get NULL prz in ramoops_get_next_prz
ramoops_get_next_prz get the prz according the paramters. If it get a uninitialized prz, access its members by following persistent_ram_old_size(prz) will cause a NULL pointer crash. Ex: if ftrace_size is 0, fprz will be NULL. Fix it by return NULL in advance. Signed-off-by: Liu ShuoX <shuox.liu@intel.com> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Tony Luck <tony.luck@intel.com>
-rw-r--r--fs/pstore/ram.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 1daed280f1b6..6f96d8c2a711 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -119,6 +119,8 @@ ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
return NULL;
prz = przs[i];
+ if (!prz)
+ return NULL;
/* Update old/shadowed buffer. */
if (update)