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reiserfs: Check the return value from __getblk()

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__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) <[email protected]>
Link: https://lore.kernel.org/lkml/CAFcO6XOacq3hscbXevPQP7sXRoYFz34ZdKPYjmd6k5sZuhGFDw@mail.gmail.com/
Tested-by: butt3rflyh4ck <[email protected]>
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2") # probably introduced in 2002
Acked-by: Edward Shishkin <[email protected]>
Signed-off-by: Christian Brauner <[email protected]>
This commit is contained in:
Matthew Wilcox
2023-07-10 14:36:10 +02:00
committed by Christian Brauner
parent e2393b8f39
commit ba38980add
1 changed files with 3 additions and 1 deletions
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fs/reiserfs/journal.c
+3 -1
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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;