[PATCH] Test for sb_getblk return value

[cascardo/linux.git] / fs / ext3 / resize.c

diff --git a/fs/ext3/resize.c b/fs/ext3/resize.c
index 57f7910..1be78b4 100644 (file)
--- a/fs/ext3/resize.c
+++ b/fs/ext3/resize.c
@@ -118,6 +118,8 @@ static struct buffer_head *bclean(handle_t *handle, struct super_block *sb,
        int err;
 
        bh = sb_getblk(sb, blk);
+       if (!bh)
+               return ERR_PTR(-EIO);
        if ((err = ext3_journal_get_write_access(handle, bh))) {
                brelse(bh);
                bh = ERR_PTR(err);
@@ -202,6 +204,10 @@ static int setup_new_group_blocks(struct super_block *sb,
                ext3_debug("update backup group %#04lx (+%d)\n", block, bit);
 
                gdb = sb_getblk(sb, block);
+               if (!gdb) {
+                       err = -EIO;
+                       goto exit_bh;
+               }
                if ((err = ext3_journal_get_write_access(handle, gdb))) {
                        brelse(gdb);
                        goto exit_bh;
@@ -643,6 +649,10 @@ static void update_backups(struct super_block *sb,
                        break;
 
                bh = sb_getblk(sb, group * bpg + blk_off);
+               if (!bh) {
+                       err = -EIO;
+                       break;
+               }
                ext3_debug("update metadata backup %#04lx\n",
                          (unsigned long)bh->b_blocknr);
                if ((err = ext3_journal_get_write_access(handle, bh)))