From: Mike Marshall <hubcap@omnibond.com> mainline inclusion from mainline-v6.14-rc1 commit f7c848431632598ff9bce57a659db6af60d75b39 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBPC4Q Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- I got a syzbot report: slab-out-of-bounds Read in orangefs_debug_write... several people suggested fixes, I tested Al Viro's suggestion and made this patch. Signed-off-by: Mike Marshall <hubcap@omnibond.com> Reported-by: syzbot+fc519d7875f2d9186c1f@syzkaller.appspotmail.com Signed-off-by: Yifan Qiao <qiaoyifan4@huawei.com> --- fs/orangefs/orangefs-debugfs.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/orangefs/orangefs-debugfs.c b/fs/orangefs/orangefs-debugfs.c index 1b508f543384..fa41db088488 100644 --- a/fs/orangefs/orangefs-debugfs.c +++ b/fs/orangefs/orangefs-debugfs.c @@ -393,9 +393,9 @@ static ssize_t orangefs_debug_write(struct file *file, * Thwart users who try to jamb a ridiculous number * of bytes into the debug file... */ - if (count > ORANGEFS_MAX_DEBUG_STRING_LEN + 1) { + if (count > ORANGEFS_MAX_DEBUG_STRING_LEN) { silly = count; - count = ORANGEFS_MAX_DEBUG_STRING_LEN + 1; + count = ORANGEFS_MAX_DEBUG_STRING_LEN; } buf = kzalloc(ORANGEFS_MAX_DEBUG_STRING_LEN, GFP_KERNEL); -- 2.39.2