diff options
| author | Colin Ian King <colin.king@canonical.com> | 2012-11-14 11:49:53 +0000 |
|---|---|---|
| committer | Anton Vorontsov <anton.vorontsov@linaro.org> | 2012-11-14 18:30:21 -0800 |
| commit | 70a6f46d7b0ec03653b9ab3f8063a9717a4a53ef (patch) | |
| tree | 9083a77f2a4c97e1658a3db8019f29599a4dd187 | |
| parent | 77b67063bb6bce6d475e910d3b886a606d0d91f7 (diff) | |
pstore: Fix NULL pointer dereference in console writes
Passing a NULL id causes a NULL pointer deference in writers such as
erst_writer and efi_pstore_write because they expect to update this id.
Pass a dummy id instead.
This avoids a cascade of oopses caused when the initial
pstore_console_write passes a null which in turn causes writes to the
console causing further oopses in subsequent pstore_console_write calls.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: stable@vger.kernel.org
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
| -rw-r--r-- | fs/pstore/platform.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c index a40da07e93d..947fbe06c3b 100644 --- a/fs/pstore/platform.c +++ b/fs/pstore/platform.c @@ -161,6 +161,7 @@ static void pstore_console_write(struct console *con, const char *s, unsigned c) while (s < e) { unsigned long flags; + u64 id; if (c > psinfo->bufsize) c = psinfo->bufsize; @@ -172,7 +173,7 @@ static void pstore_console_write(struct console *con, const char *s, unsigned c) spin_lock_irqsave(&psinfo->buf_lock, flags); } memcpy(psinfo->buf, s, c); - psinfo->write(PSTORE_TYPE_CONSOLE, 0, NULL, 0, c, psinfo); + psinfo->write(PSTORE_TYPE_CONSOLE, 0, &id, 0, c, psinfo); spin_unlock_irqrestore(&psinfo->buf_lock, flags); s += c; c = e - s; |