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| author | Kees Cook <keescook@chromium.org> | 2018-12-03 16:39:01 -0800 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2018-12-03 17:11:02 -0800 |
| commit | 8665569e97dd52920713b95675409648986b5b0d (patch) | |
| tree | bdada3a5c2f1cd06ab97f37dd9736217d7167bc8 | |
| parent | ea84b580b95521644429cc6748b6c2bf27c8b0f3 (diff) | |
| download | linux-8665569e97dd52920713b95675409648986b5b0d.tar.gz linux-8665569e97dd52920713b95675409648986b5b0d.tar.bz2 linux-8665569e97dd52920713b95675409648986b5b0d.zip | |
pstore/ram: Avoid NULL deref in ftrace merging failure path
Given corruption in the ftrace records, it might be possible to allocate
tmp_prz without assigning prz to it, but still marking it as needing to
be freed, which would cause at least a NULL dereference.
smatch warnings:
fs/pstore/ram.c:340 ramoops_pstore_read() error: we previously assumed 'prz' could be null (see line 255)
https://lists.01.org/pipermail/kbuild-all/2018-December/055528.html
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 2fbea82bbb89 ("pstore: Merge per-CPU ftrace records into one")
Cc: "Joel Fernandes (Google)" <joel@joelfernandes.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
| -rw-r--r-- | fs/pstore/ram.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c index e6d9560ea455..96f7d32cd184 100644 --- a/fs/pstore/ram.c +++ b/fs/pstore/ram.c @@ -291,6 +291,7 @@ static ssize_t ramoops_pstore_read(struct pstore_record *record) GFP_KERNEL); if (!tmp_prz) return -ENOMEM; + prz = tmp_prz; free_prz = true; while (cxt->ftrace_read_cnt < cxt->max_ftrace_cnt) { @@ -309,7 +310,6 @@ static ssize_t ramoops_pstore_read(struct pstore_record *record) goto out; } record->id = 0; - prz = tmp_prz; } } |