lkml.org 
[lkml]   [2019]   [Dec]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH][next] io_uring: fix missing error return when percpu_ref_init fails
Date
From: Colin Ian King <colin.king@canonical.com>

Currently when the call to percpu_ref_init fails ctx->file_data is
set to null and because there is a missing return statement the
following statement dereferences this null pointer causing an oops.
Fix this by adding the missing -ENOMEM return to avoid the oops.

Addresses-Coverity: ("Explicit null dereference")
Fixes: cbb537634780 ("io_uring: avoid ring quiesce for fixed file set unregister and update")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
fs/io_uring.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index c756b8fc44c6..1d31294f5914 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4937,6 +4937,7 @@ static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
kfree(ctx->file_data->table);
kfree(ctx->file_data);
ctx->file_data = NULL;
+ return -ENOMEM;
}
ctx->file_data->put_llist.first = NULL;
INIT_WORK(&ctx->file_data->ref_work, io_ring_file_ref_switch);
--
2.24.0
\
 
 \ /
  Last update: 2019-12-21 00:34    [W:0.024 / U:1.296 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site