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authorLiu ShuoX <shuox.liu@intel.com>2014-03-17 11:24:49 +1100
committerTony Luck <tony.luck@intel.com>2014-03-17 14:14:03 -0700
commitaa9a4a1edfbd3d223af01db833da2f07850bc655 (patch)
tree3c131b8ea82a437d97439dfc3e607052fc8cfaff /fs/pstore
parent57fd835385a043577457a385f28c08be693991bf (diff)
downloadlinux-aa9a4a1edfbd3d223af01db833da2f07850bc655.tar.bz2
pstore: skip zero size persistent ram buffer in traverse
In ramoops_pstore_read, a valid prz pointer with zero size buffer will break traverse of all persistent ram buffers. The latter buffer might be lost. Signed-off-by: Liu ShuoX <shuox.liu@intel.com> Cc: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com> Cc: Colin Cross <ccross@android.com> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'fs/pstore')
-rw-r--r--fs/pstore/ram.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 9fe5b13295e0..1daed280f1b6 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -120,12 +120,12 @@ ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
prz = przs[i];
- if (update) {
- /* Update old/shadowed buffer. */
+ /* Update old/shadowed buffer. */
+ if (update)
persistent_ram_save_old(prz);
- if (!persistent_ram_old_size(prz))
- return NULL;
- }
+
+ if (!persistent_ram_old_size(prz))
+ return NULL;
*typep = type;
*id = i;