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| author | P J P <ppandit@redhat.com> | 2013-04-03 04:38:00 +0200 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2013-04-03 10:27:52 +0200 |
| commit | cfb185a1488810fbae9256c7d52f66c558c6ea04 (patch) | |
| tree | 5d6f89c0d25fcbf4cfdf37edc1e59f7e43df8636 /fs/f2fs | |
| parent | f2fs: fix the bitmap consistency of dirty segments (diff) | |
| download | linux-cfb185a1488810fbae9256c7d52f66c558c6ea04.tar.xz linux-cfb185a1488810fbae9256c7d52f66c558c6ea04.zip | |
f2fs: add NULL pointer check
Commit - fa9150a84c - replaces a call to generic_writepages() in
f2fs_write_data_pages() with write_cache_pages(), with a function pointer
argument pointing to routine: __f2fs_writepage.
-> https://git.kernel.org/linus/fa9150a84ca333f68127097c4fa1eda4b3913a22
This patch adds a NULL pointer check in f2fs_write_data_pages() to avoid
a possible NULL pointer dereference, in case if - mapping->a_ops->writepage -
is NULL.
Signed-off-by: P J P <ppandit@redhat.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Diffstat (limited to 'fs/f2fs')
| -rw-r--r-- | fs/f2fs/data.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 47a2d7c87ea9..cf9ff5f76134 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -559,6 +559,10 @@ static int f2fs_write_data_pages(struct address_space *mapping, int ret; long excess_nrtw = 0, desired_nrtw; + /* deal with chardevs and other special file */ + if (!mapping->a_ops->writepage) + return 0; + if (wbc->nr_to_write < MAX_DESIRED_PAGES_WP) { desired_nrtw = MAX_DESIRED_PAGES_WP; excess_nrtw = desired_nrtw - wbc->nr_to_write; |