fs/squashfs: add sqfs_dir_offset() error checks

sqfs_dir_offset() returns a negative errno on failure, but three
call sites in sqfs_search_dir() use the return value as an array
index without checking for errors first. If the lookup fails,
dirs->table is set to an invalid address, leading to undefined
behavior.

Add negative-value guards after each sqfs_dir_offset() call so
that any lookup failure propagates cleanly as an error rather
than producing incorrect results.

Note: the corresponding sqfs_find_inode() NULL checks and the
heap exhaustion fix during symlink resolution are applied in
separate patches.

Acked-by: Miquel Raynal <[email protected]>
Reviewed-by: Richard Genoud <[email protected]>
Signed-off-by: Allan ELKAIM <[email protected]>

0 files changed, 0 insertions, 0 deletions