Check that the allocation group number is not greater or equal to the number of allocations group in the file system and return BEF_ERR in the case of error.
Signed-off-by: Salah Triki <salah.tr...@gmail.com> --- fs/befs/befs.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/befs/befs.h b/fs/befs/befs.h index 55f3ea2..6daf4c4 100644 --- a/fs/befs/befs.h +++ b/fs/befs/befs.h @@ -121,6 +121,11 @@ BEFS_I(const struct inode *inode) static inline befs_blocknr_t iaddr2blockno(struct super_block *sb, const befs_inode_addr *iaddr) { + if (iaddr->allocation_group >= BEFS_SB(sb)->num_ags) { + befs_error(sb, "BEFS: Invalid allocation group %u, max is %u", + iaddr->allocation_group, BEFS_SB(sb)->num_ags); + return BEFS_ERR; + } return ((iaddr->allocation_group << BEFS_SB(sb)->ag_shift) + iaddr->start); } -- 1.9.1