diff options
| author | Eric Sandeen <sandeen@redhat.com> | 2021-07-13 18:49:23 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-20 17:02:28 +0300 |
| commit | 514b6531b1cbb64199db63bfdb80953d71998cca (patch) | |
| tree | 2a071ce7ce4ed91d914c77268cdcda310da6a83d | |
| parent | eeae4230dbf181f318a6604a74106765e0c66248 (diff) | |
| download | linux-514b6531b1cbb64199db63bfdb80953d71998cca.tar.xz | |
seq_file: disallow extremely large seq buffer allocations
commit 8cae8cd89f05f6de223d63e6d15e31c8ba9cf53b upstream.
There is no reasonable need for a buffer larger than this, and it avoids
int overflow pitfalls.
Fixes: 058504edd026 ("fs/seq_file: fallback to vmalloc allocation")
Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Reported-by: Qualys Security Advisory <qsa@qualys.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/seq_file.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/seq_file.c b/fs/seq_file.c index cb11a34fb871..1cfae052439d 100644 --- a/fs/seq_file.c +++ b/fs/seq_file.c @@ -32,6 +32,9 @@ static void seq_set_overflow(struct seq_file *m) static void *seq_buf_alloc(unsigned long size) { + if (unlikely(size > MAX_RW_COUNT)) + return NULL; + return kvmalloc(size, GFP_KERNEL_ACCOUNT); } |