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Message-Id: <1331498791-2455-1-git-send-email-tytso@mit.edu> Date: Sun, 11 Mar 2012 16:46:31 -0400 From: Theodore Ts'o <tytso@....edu> To: Ext4 Developers List <linux-ext4@...r.kernel.org> Cc: merll@....de, Theodore Ts'o <tytso@....edu> Subject: [PATCH] ext4: check for zero length extent Explicitly test for an extent whose length is zero, and flag that as a corrupted extent. This avoids a kernel BUG_ON assertion failure. Tested: Without this patch, the file system image found in tests/f_ext_zero_len/image.gz in the latest e2fsprogs sources causes a kernel panic. With this patch, an ext4 file systmem error is noted instead, and the file system is marked as being corrupted. https://bugzilla.kernel.org/show_bug.cgi?id=42859 Signed-off-by: "Theodore Ts'o" <tytso@....edu> --- fs/ext4/extents.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 74f23c2..203885c 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -300,6 +300,8 @@ static int ext4_valid_extent(struct inode *inode, struct ext4_extent *ext) ext4_fsblk_t block = ext4_ext_pblock(ext); int len = ext4_ext_get_actual_len(ext); + if (!len) + return 0; return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, len); } -- 1.7.9.107.g97f9a -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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