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reiserfs: Check the return value from __getblk() 

[ Upstream commit ba38980add ]

__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: 1da177e4c3 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Matthew Wilcox 2023-06-04 12:16:06 +01:00 committed by Greg Kroah-Hartman
parent 61e2589dec
commit fcc2b8ac9e
1 changed files with 3 additions and 1 deletions
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4
fs/reiserfs/journal.c
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@ -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;