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Haogang Chen authored
In alloc_flex_gd(), when flexbg_size is large, kmalloc size would overflow and flex_gd->groups would point to a buffer smaller than expected, causing OOB accesses when it is used. Note that in ext4_resize_fs(), flexbg_size is calculated using sbi->s_log_groups_per_flex, which is read from the disk and only bounded to [1, 31]. The patch returns NULL for too large flexbg_size. Reviewed-by:
Eric Sandeen <sandeen@redhat.com> Signed-off-by:
Haogang Chen <haogangchen@gmail.com> Signed-off-by:
"Theodore Ts'o" <tytso@mit.edu> Cc: stable@kernel.org
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