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| author | Al Viro <viro@ZenIV.linux.org.uk> | 2013-11-19 01:20:43 +0000 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-11-18 19:07:53 -0800 |
| commit | 801a76050bcf8d4e500eb8d048ff6265f37a61c8 (patch) | |
| tree | 261258d2a4f61f07f238c18ea1087fca6eea9947 /fs/seq_file.c | |
| parent | 27b5c3f3cc9c5ce0702db1cca718c827e8b689e9 (diff) | |
| download | lwn-801a76050bcf8d4e500eb8d048ff6265f37a61c8.tar.gz lwn-801a76050bcf8d4e500eb8d048ff6265f37a61c8.zip | |
seq_file: always clear m->count when we free m->buf
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>
Diffstat (limited to 'fs/seq_file.c')
| -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 1cd2388ca5bd..1d641bb108d2 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); |