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ext4: Avoid null pointer dereference when decoding EROFS w/o a journal 

We need to check to make sure a journal is present before checking the
journal flags in ext4_decode_error().

Signed-off-by: Eric Sesterhenn <eric.sesterhenn@lsexperts.de>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2009-07-27 23:09:47 -04:00
parent 43b3852029
commit 78f1ddbb49
1 changed files with 2 additions and 1 deletions
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3
fs/ext4/super.c
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@ -344,7 +344,8 @@ static const char *ext4_decode_error(struct super_block *sb, int errno,
errstr = "Out of memory";
break;
case -EROFS:
if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
if (!sb || (EXT4_SB(sb)->s_journal &&
EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
errstr = "Journal has aborted";
else
errstr = "Readonly filesystem";