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btrfs-progs: fix double free on error in read_raid56() 

Reported by 'gcc -fanalyzer':
kernel-shared/extent_io.c: In function ‘read_raid56’:
./include/kerncompat.h:393:18: warning: dereference of NULL ‘pointers’ [CWE-476] [-Wanalyzer-null-dereference]

After allocation of the pointers array fails it's dereferenced in the
exit block. We can return immediately instead.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2024-04-04 00:55:47 +02:00
parent 2bdb838d54
commit 844caf8639
1 changed files with 3 additions and 4 deletions
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7
kernel-shared/extent_io.c
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@ -339,10 +339,9 @@ static int read_raid56(struct btrfs_fs_info *fs_info, void *buf, u64 logical,
ASSERT(len <= BTRFS_STRIPE_LEN);
pointers = calloc(num_stripes, sizeof(void *));
if (!pointers) {
ret = -ENOMEM;
goto out;
}
if (!pointers)
return -ENOMEM;
/* Allocate memory for the full stripe */
for (i = 0; i < num_stripes; i++) {
pointers[i] = kmalloc(BTRFS_STRIPE_LEN, GFP_KERNEL);