From: Namjae Jeon Date: Sat, 12 Jul 2014 20:11:42 +0000 (-0400) Subject: ext4: fix potential null pointer dereference in ext4_free_inode X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=bf40c92635d63fcc574c52649f7cda13e0418ac1;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git ext4: fix potential null pointer dereference in ext4_free_inode Fix potential null pointer dereferencing problem caused by e43bb4e612 ("ext4: decrement free clusters/inodes counters when block group declared bad") Reported-by: Dan Carpenter Signed-off-by: Namjae Jeon Signed-off-by: Ashish Sangwan Signed-off-by: Theodore Ts'o Reviewed-by: Lukas Czerner --- diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c index 0840bf321cdb..5b87fc36aab8 100644 --- a/fs/ext4/ialloc.c +++ b/fs/ext4/ialloc.c @@ -338,7 +338,7 @@ out: fatal = err; } else { ext4_error(sb, "bit already cleared for inode %lu", ino); - if (!EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) { + if (gdp && !EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) { int count; count = ext4_free_inodes_count(sb, gdp); percpu_counter_sub(&sbi->s_freeinodes_counter,