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* [PATCH] ext4: fix potential null pointer dereference in ext4_free_inode
@ 2014-07-08  5:41 Namjae Jeon
  2014-07-08 11:00 ` Lukáš Czerner
  0 siblings, 1 reply; 2+ messages in thread
From: Namjae Jeon @ 2014-07-08  5:41 UTC (permalink / raw)
  To: Theodore Ts'o; +Cc: linux-ext4, 'Dan Carpenter', Ashish Sangwan

Fix potential null pointer dereferencing problem caused by e43bb4e612
("ext4: decrement free clusters/inodes counters when block group declared bad")

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Ashish Sangwan <a.sangwan@samsung.com>
---
 fs/ext4/ialloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index a87455d..6bfe7eb 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -338,7 +338,7 @@ out:
 			fatal = err;
 	} else {
 		ext4_error(sb, "bit already cleared for inode %lu", ino);
-		if (!EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) {
+		if (gdp && !EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) {
 			int count;
 			count = ext4_free_inodes_count(sb, gdp);
 			percpu_counter_sub(&sbi->s_freeinodes_counter,
-- 
1.7.11-rc0


^ permalink raw reply related	[flat|nested] 2+ messages in thread

* Re: [PATCH] ext4: fix potential null pointer dereference in ext4_free_inode
  2014-07-08  5:41 [PATCH] ext4: fix potential null pointer dereference in ext4_free_inode Namjae Jeon
@ 2014-07-08 11:00 ` Lukáš Czerner
  0 siblings, 0 replies; 2+ messages in thread
From: Lukáš Czerner @ 2014-07-08 11:00 UTC (permalink / raw)
  To: Namjae Jeon
  Cc: Theodore Ts'o, linux-ext4, 'Dan Carpenter',
	Ashish Sangwan

On Tue, 8 Jul 2014, Namjae Jeon wrote:

> Date: Tue, 08 Jul 2014 14:41:22 +0900
> From: Namjae Jeon <namjae.jeon@samsung.com>
> To: Theodore Ts'o <tytso@mit.edu>
> Cc: linux-ext4 <linux-ext4@vger.kernel.org>,
>     'Dan Carpenter' <dan.carpenter@oracle.com>,
>     Ashish Sangwan <a.sangwan@samsung.com>
> Subject: [PATCH] ext4: fix potential null pointer dereference in
>     ext4_free_inode
> 
> Fix potential null pointer dereferencing problem caused by e43bb4e612
> ("ext4: decrement free clusters/inodes counters when block group declared bad")
> 
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
> Signed-off-by: Ashish Sangwan <a.sangwan@samsung.com>

Looks good.

Reviewed-by: Lukas Czerner <lczerner@redhat.com>

> ---
>  fs/ext4/ialloc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
> index a87455d..6bfe7eb 100644
> --- a/fs/ext4/ialloc.c
> +++ b/fs/ext4/ialloc.c
> @@ -338,7 +338,7 @@ out:
>  			fatal = err;
>  	} else {
>  		ext4_error(sb, "bit already cleared for inode %lu", ino);
> -		if (!EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) {
> +		if (gdp && !EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) {
>  			int count;
>  			count = ext4_free_inodes_count(sb, gdp);
>  			percpu_counter_sub(&sbi->s_freeinodes_counter,
> 

^ permalink raw reply	[flat|nested] 2+ messages in thread

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2014-07-08  5:41 [PATCH] ext4: fix potential null pointer dereference in ext4_free_inode Namjae Jeon
2014-07-08 11:00 ` Lukáš Czerner

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