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authorMatthew Wilcox <willy@infradead.org>2023-06-04 12:16:06 +0100
committerChristian Brauner <brauner@kernel.org>2023-07-10 14:36:10 +0200
commitba38980add7ffc9e674ada5b4ded4e7d14e76581 (patch)
tree51a9aadd76d8a74988fa95ec3429113c16c073a7 /fs/reiserfs
parente2393b8f3987c5f29dca03aa71d0502f6d721c0d (diff)
reiserfs: Check the return value from __getblk()
__getblk() can return a NULL pointer if we run out of memory or if we try to access beyond the end of the device; check it and handle it appropriately. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Link: https://lore.kernel.org/lkml/CAFcO6XOacq3hscbXevPQP7sXRoYFz34ZdKPYjmd6k5sZuhGFDw@mail.gmail.com/ Tested-by: butt3rflyh4ck <butterflyhuangxx@gmail.com> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") # probably introduced in 2002 Acked-by: Edward Shishkin <edward.shishkin@gmail.com> Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/reiserfs')
-rw-r--r--fs/reiserfs/journal.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c
index 479aa4a57602..015bfe4e4524 100644
--- a/fs/reiserfs/journal.c
+++ b/fs/reiserfs/journal.c
@@ -2326,7 +2326,7 @@ static struct buffer_head *reiserfs_breada(struct block_device *dev,
int i, j;
bh = __getblk(dev, block, bufsize);
- if (buffer_uptodate(bh))
+ if (!bh || buffer_uptodate(bh))
return (bh);
if (block + BUFNR > max_block) {
@@ -2336,6 +2336,8 @@ static struct buffer_head *reiserfs_breada(struct block_device *dev,
j = 1;
for (i = 1; i < blocks; i++) {
bh = __getblk(dev, block + i, bufsize);
+ if (!bh)
+ break;
if (buffer_uptodate(bh)) {
brelse(bh);
break;