From: Rand Deeb Date: Thu, 20 Feb 2025 09:43:49 +0000 (+0300) Subject: fs/jfs: cast inactags to s64 to prevent potential overflow X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=70ca3246ad201b53a9f09380b3f29d8bac320383;p=users%2Fjedix%2Flinux-maple.git fs/jfs: cast inactags to s64 to prevent potential overflow The expression "inactags << bmp->db_agl2size" in the function dbFinalizeBmap() is computed using int operands. Although the values (inactags and db_agl2size) are derived from filesystem parameters and are usually small, there is a theoretical risk that the shift could overflow a 32-bit int if extreme values occur. According to the C standard, shifting a signed 32-bit int can lead to undefined behavior if the result exceeds its range. In our case, an overflow could miscalculate free blocks, potentially leading to erroneous filesystem accounting. To ensure the arithmetic is performed in 64-bit space, we cast "inactags" to s64 before shifting. This defensive fix prevents any risk of overflow and complies with kernel coding best practices. Found by Linux Verification Center (linuxtesting.org) with SVACE. Signed-off-by: Rand Deeb Signed-off-by: Dave Kleikamp --- diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c index f9009e4f9ffd..f89f07c9580e 100644 --- a/fs/jfs/jfs_dmap.c +++ b/fs/jfs/jfs_dmap.c @@ -3666,8 +3666,8 @@ void dbFinalizeBmap(struct inode *ipbmap) * system size is not a multiple of the group size). */ inactfree = (inactags && ag_rem) ? - ((inactags - 1) << bmp->db_agl2size) + ag_rem - : inactags << bmp->db_agl2size; + (((s64)inactags - 1) << bmp->db_agl2size) + ag_rem + : ((s64)inactags << bmp->db_agl2size); /* determine how many free blocks are in the active * allocation groups plus the average number of free blocks