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| author | Al Viro <viro@ZenIV.linux.org.uk> | 2013-11-19 01:20:43 +0000 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2015-05-15 09:10:56 +0200 |
| commit | bb1317a3eb0f8cc3615e77cfa83b2902f35906d8 (patch) | |
| tree | b15d81c0c81b77b633c488698178cfcc6e8807c4 /fs | |
| parent | a58d83a1a10afa8b19a026859bcb6c47832975a8 (diff) | |
| download | lwn-bb1317a3eb0f8cc3615e77cfa83b2902f35906d8.tar.gz lwn-bb1317a3eb0f8cc3615e77cfa83b2902f35906d8.zip | |
seq_file: always clear m->count when we free m->buf
commit 801a76050bcf8d4e500eb8d048ff6265f37a61c8 upstream.
Once we'd freed m->buf, m->count should become zero - we have no valid
contents reachable via m->buf.
Reported-by: Charley (Hao Chuan) Chu <charley.chu@broadcom.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/seq_file.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/seq_file.c b/fs/seq_file.c index a290157265ef..092951efaf43 100644 --- a/fs/seq_file.c +++ b/fs/seq_file.c @@ -136,6 +136,7 @@ static int traverse(struct seq_file *m, loff_t offset) Eoverflow: m->op->stop(m, p); kfree(m->buf); + m->count = 0; m->buf = kmalloc(m->size <<= 1, GFP_KERNEL); return !m->buf ? -ENOMEM : -EAGAIN; } @@ -232,10 +233,10 @@ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos) goto Fill; m->op->stop(m, p); kfree(m->buf); + m->count = 0; m->buf = kmalloc(m->size <<= 1, GFP_KERNEL); if (!m->buf) goto Enomem; - m->count = 0; m->version = 0; pos = m->index; p = m->op->start(m, &pos); |