From 2973dfdb877c17b36c27ba66d71028ff1eb2f32e Mon Sep 17 00:00:00 2001 From: Glauber de Oliveira Costa Date: Sun, 30 Oct 2005 15:03:05 -0800 Subject: [PATCH] Test for sb_getblk return value This patch adds tests for the return value of sb_getblk() in the ext2/3 filesystems. In fs/buffer.c it is stated that the getblk() function never fails. However, it does can return NULL in some situations due to I/O errors, which may lead us to NULL pointer dereferences Signed-off-by: Glauber de Oliveira Costa Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/ext3/resize.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'fs/ext3/resize.c') diff --git a/fs/ext3/resize.c b/fs/ext3/resize.c index 57f79106267d..1be78b4b4de9 100644 --- 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))) -- cgit v1.2.1