diff options
| author | Liu ShuoX <shuox.liu@intel.com> | 2014-03-17 13:57:49 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-02-05 22:35:40 -0800 |
| commit | 979d65e705225f8780c09ceb9b4cbc2cbdc36c6e (patch) | |
| tree | 30618ad8cfe5947b88dac5a3c3e28981f00d2ac3 /fs | |
| parent | ca889efda7bb061eb29716ba34a3271c298eb948 (diff) | |
pstore: Fix NULL pointer fault if get NULL prz in ramoops_get_next_prz
commit b0aa931fb84431394d995472d0af2a6c2b61064d upstream.
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>
Cc: HuKeping <hukeping@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/pstore/ram.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c index e0e42b5a691c..d3d37142bd93 100644 --- a/fs/pstore/ram.c +++ b/fs/pstore/ram.c @@ -125,6 +125,8 @@ 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) |