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authorPavel Begunkov <asml.silence@gmail.com>2020-11-04 16:39:31 +0300
committerJens Axboe <axboe@kernel.dk>2020-11-04 20:22:57 +0300
commit99b328084f6a98bcee9fcd423c82ccfd52115da5 (patch)
tree645092070dc0fcfc533c7a13fd5af4b2b3de234b /fs
parentcb8a8ae310741d743fd02982307797f6a126f614 (diff)
downloadlinux-99b328084f6a98bcee9fcd423c82ccfd52115da5.tar.xz
io_uring: fix overflowed cancel w/ linked ->files
Current io_match_files() check in io_cqring_overflow_flush() is useless because requests drop ->files before going to the overflow list, however linked to it request do not, and we don't check them. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs')
-rw-r--r--fs/io_uring.c43
1 files changed, 21 insertions, 22 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 728f3a368a01..d6f7f8b3837f 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1593,14 +1593,29 @@ static void io_cqring_mark_overflow(struct io_ring_ctx *ctx)
}
}
-static inline bool io_match_files(struct io_kiocb *req,
- struct files_struct *files)
+static inline bool __io_match_files(struct io_kiocb *req,
+ struct files_struct *files)
{
+ return ((req->flags & REQ_F_WORK_INITIALIZED) &&
+ (req->work.flags & IO_WQ_WORK_FILES)) &&
+ req->work.identity->files == files;
+}
+
+static bool io_match_files(struct io_kiocb *req,
+ struct files_struct *files)
+{
+ struct io_kiocb *link;
+
if (!files)
return true;
- if ((req->flags & REQ_F_WORK_INITIALIZED) &&
- (req->work.flags & IO_WQ_WORK_FILES))
- return req->work.identity->files == files;
+ if (__io_match_files(req, files))
+ return true;
+ if (req->flags & REQ_F_LINK_HEAD) {
+ list_for_each_entry(link, &req->link_list, link_list) {
+ if (__io_match_files(link, files))
+ return true;
+ }
+ }
return false;
}
@@ -8406,22 +8421,6 @@ static bool io_match_link(struct io_kiocb *preq, struct io_kiocb *req)
return false;
}
-static bool io_match_link_files(struct io_kiocb *req,
- struct files_struct *files)
-{
- struct io_kiocb *link;
-
- if (io_match_files(req, files))
- return true;
- if (req->flags & REQ_F_LINK_HEAD) {
- list_for_each_entry(link, &req->link_list, link_list) {
- if (io_match_files(link, files))
- return true;
- }
- }
- return false;
-}
-
/*
* We're looking to cancel 'req' because it's holding on to our files, but
* 'req' could be a link to another request. See if it is, and cancel that
@@ -8504,7 +8503,7 @@ static void io_cancel_defer_files(struct io_ring_ctx *ctx,
spin_lock_irq(&ctx->completion_lock);
list_for_each_entry_reverse(de, &ctx->defer_list, list) {
- if (io_match_link_files(de->req, files)) {
+ if (io_match_files(de->req, files)) {
list_cut_position(&list, &ctx->defer_list, &de->list);
break;
}