diff options
| author | Al Viro <viro@ZenIV.linux.org.uk> | 2012-08-20 15:28:00 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-09-14 10:00:37 -0700 |
| commit | 57dba9b60a1ad31042a8e90fafe2a58fba789177 (patch) | |
| tree | ada7ef192c765e7d59f06a54009311ba3d10ed4a | |
| parent | 0253e78cc196ba320a093401a12ab0e5f244a3e9 (diff) | |
vfs: missed source of ->f_pos races
commit 0e665d5d1125f9f4ccff56a75e814f10f88861a2 upstream.
compat_sys_{read,write}v() need the same "pass a copy of file->f_pos" thing
as sys_{read,write}{,v}().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/compat.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/compat.c b/fs/compat.c index 0ea00832de23..e5358c25e133 100644 --- a/fs/compat.c +++ b/fs/compat.c @@ -1177,11 +1177,14 @@ compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec, struct file *file; int fput_needed; ssize_t ret; + loff_t pos; file = fget_light(fd, &fput_needed); if (!file) return -EBADF; - ret = compat_readv(file, vec, vlen, &file->f_pos); + pos = file->f_pos; + ret = compat_readv(file, vec, vlen, &pos); + file->f_pos = pos; fput_light(file, fput_needed); return ret; } @@ -1236,11 +1239,14 @@ compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, struct file *file; int fput_needed; ssize_t ret; + loff_t pos; file = fget_light(fd, &fput_needed); if (!file) return -EBADF; - ret = compat_writev(file, vec, vlen, &file->f_pos); + pos = file->f_pos; + ret = compat_writev(file, vec, vlen, &pos); + file->f_pos = pos; fput_light(file, fput_needed); return ret; } |