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| author | Al Viro <viro@ZenIV.linux.org.uk> | 2012-08-20 15:28:00 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-08-20 10:11:47 -0700 |
| commit | 0e665d5d1125f9f4ccff56a75e814f10f88861a2 (patch) | |
| tree | 2f05f399fe4845893180fd9d7ea80b711e178e9e /fs/compat.c | |
| parent | 90785be317dabdef6e9763e75e370991a6a46c91 (diff) | |
| download | lwn-0e665d5d1125f9f4ccff56a75e814f10f88861a2.tar.gz lwn-0e665d5d1125f9f4ccff56a75e814f10f88861a2.zip | |
vfs: missed source of ->f_pos races
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>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/compat.c')
| -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 6161255fac45..1bdb350ea5d3 100644 --- a/fs/compat.c +++ b/fs/compat.c @@ -1155,11 +1155,14 @@ 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; } @@ -1221,11 +1224,14 @@ 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; } |