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ubifs bad superblock bug

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This patch fixes an issue when ubifs reads a bad superblock. Later it
tries to free memory, that was not allocated, which freezes u-boot.
This is fixed by looking for a non null pointer before free.

The message I got before u-boot freezes:
UBI: max/mean erase counter: 53/32
UBIFS: mounted UBI device 0, volume 1, name "rootfs"
UBIFS: mounted read-only
UBIFS: file system size:   49140 bytes (50319360 KiB, 0 MiB, 49140 LEBs)
UBIFS: journal size:       49 bytes (6838272 KiB, 0 MiB, 6678 LEBs)
UBIFS: media format:       w4/r0 (latest is w4/r0)
UBIFS: default compressor: LZO
UBIFS: reserved for root:  0 bytes (0 KiB)
UBIFS error (pid 0): ubifs_read_node: bad node type (255 but expected 9)
UBIFS error (pid 0): ubifs_read_node: bad node at LEB 330:13104
UBIFS error (pid 0): ubifs_iget: failed to read inode 1, error -22
Error reading superblock on volume 'ubi:rootfs'!

Signed-off-by: Lars Poeschel <larsi@wh2.tu-dresden.de>
Cc: Kyungmin Park <kmpark@infradead.org>
Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Lars Poeschel 2011-10-12 11:31:19 +02:00 committed by Stefan Roese
parent 0841ca90f2
commit 349a8d5e56
1 changed files with 4 additions and 2 deletions
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6
fs/ubifs/super.c
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@ -848,8 +848,10 @@ void ubifs_umount(struct ubifs_info *c)
ubifs_debugging_exit(c);
/* Finally free U-Boot's global copy of superblock */
free(ubifs_sb->s_fs_info);
free(ubifs_sb);
if (ubifs_sb != NULL) {
free(ubifs_sb->s_fs_info);
free(ubifs_sb);
}
}
/**