The 'commit e9a7c2f1a548 ("autofs4: coding style fixes")' removed the
check done on the __vfs_write()'s returned value in autofs4_write().
This may lead to a spinning process which can't catch any signal.
Call stack showed in xmon could be :
[c0000003a76c7500] c00000000030df74 __vfs_write+0x134/0x1c0
(unreliable)
[c0000003a76c75a0] d0000000052a35d4 autofs4_notify_daemon+0x174/0x3f0
[autofs4]
[c0000003a76c7780] d0000000052a3fa0 autofs4_wait+0x750/0xa10 [autofs4]
[c0000003a76c78b0] d0000000052a24d8 autofs4_mount_wait+0x78/0x140
[autofs4]
[c0000003a76c7930] d0000000052a2f48 autofs4_d_automount+0x1d8/0x370
[autofs4]
[c0000003a76c79c0] c0000000003221e4 follow_managed+0x204/0x3a0
[c0000003a76c7a20] c000000000322c10 lookup_fast+0x220/0x420
[c0000003a76c7a90] c00000000032324c walk_component+0x5c/0x3e0
[c0000003a76c7b00] c000000000323794 link_path_walk+0x1c4/0x5f0
[c0000003a76c7b90] c000000000324b00 path_openat+0xf0/0x1620
[c0000003a76c7c90] c000000000327f6c do_filp_open+0xfc/0x170
[c0000003a76c7dc0] c00000000030d06c do_sys_open+0x1bc/0x2e0
[c0000003a76c7e30] c000000000009260 system_call+0x38/0x108
--- Exception: c01 (System Call) at 00003fffa38a0988
Cc: Ian Kent <raven@xxxxxxxxxx>
Cc: autofs@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Greg Kurz <groug@xxxxxxxx>
Signed-off-by: Laurent Dufour <ldufour@xxxxxxxxxxxxxxxxxx>
Fixes: e9a7c2f1a548 ("autofs4: coding style fixes")
---
fs/autofs4/waitq.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
index 0146d911f468..106d94139281 100644
--- a/fs/autofs4/waitq.c
+++ b/fs/autofs4/waitq.c
@@ -66,11 +66,12 @@ static int autofs4_write(struct autofs_sb_info *sbi,
set_fs(KERNEL_DS);
mutex_lock(&sbi->pipe_mutex);
- wr = __vfs_write(file, data, bytes, &file->f_pos);
- while (bytes && wr) {
+ while (bytes) {
+ wr = __vfs_write(file, data, bytes, &file->f_pos);
+ if (wr < 0)
+ break;
data += wr;
bytes -= wr;
- wr = __vfs_write(file, data, bytes, &file->f_pos);
}
mutex_unlock(&sbi->pipe_mutex);
--
1.9.1
--
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