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Subject[PATCH 1/6] ksmbd: use vfs_llseek instead of dereferencing NULL
Date
By not checking whether llseek is NULL, this might jump to NULL. Also,
it doesn't check FMODE_LSEEK. Fix this by using vfs_llseek(), which
always does the right thing.

Fixes: f44158485826 ("cifsd: add file operations")
Cc: stable@vger.kernel.org
Cc: linux-cifs@vger.kernel.org
Cc: Namjae Jeon <namjae.jeon@samsung.com>
Cc: Steve French <stfrench@microsoft.com>
Cc: Ronnie Sahlberg <lsahlber@redhat.com>
Cc: Hyunchul Lee <hyc.lee@gmail.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
fs/ksmbd/vfs.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/ksmbd/vfs.c b/fs/ksmbd/vfs.c
index dcdd07c6efff..9cf2e2365832 100644
--- a/fs/ksmbd/vfs.c
+++ b/fs/ksmbd/vfs.c
@@ -1046,7 +1046,7 @@ int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
*out_count = 0;
end = start + length;
while (start < end && *out_count < in_count) {
- extent_start = f->f_op->llseek(f, start, SEEK_DATA);
+ extent_start = vfs_llseek(f, start, SEEK_DATA);
if (extent_start < 0) {
if (extent_start != -ENXIO)
ret = (int)extent_start;
@@ -1056,7 +1056,7 @@ int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
if (extent_start >= end)
break;

- extent_end = f->f_op->llseek(f, extent_start, SEEK_HOLE);
+ extent_end = vfs_llseek(f, extent_start, SEEK_HOLE);
if (extent_end < 0) {
if (extent_end != -ENXIO)
ret = (int)extent_end;
--
2.35.1
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