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authorKees Cook <keescook@chromium.org>2023-02-04 10:33:56 -0800
committerChristian Brauner <brauner@kernel.org>2023-06-02 10:30:09 +0200
commit820eb59da8c7ca7e705a02f37dda2be316807847 (patch)
tree10f2c7cf9147e8be8197a109963a9a4656fe8d44
parentea2b62f305893992156a798f665847e0663c9f41 (diff)
jfs: Use unsigned variable for length calculations
To avoid confusing the compiler about possible negative sizes, switch "ssize" which can never be negative from int to u32. Seen with GCC 13: ../fs/jfs/namei.c: In function 'jfs_symlink': ../include/linux/fortify-string.h:57:33: warning: '__builtin_memcpy' pointer overflow between offset 0 and size [-2147483648, -1] [-Warray-bounds=] 57 | #define __underlying_memcpy __builtin_memcpy | ^ ... ../fs/jfs/namei.c:950:17: note: in expansion of macro 'memcpy' 950 | memcpy(ip->i_link, name, ssize); | ^~~~~~ Cc: Dave Kleikamp <shaggy@kernel.org> Cc: Christian Brauner <brauner@kernel.org> Cc: Dave Chinner <dchinner@redhat.com> Cc: jfs-discussion@lists.sourceforge.net Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Jeff Xu <jeffxu@chromium.org> Message-Id: <20230204183355.never.877-kees@kernel.org> Signed-off-by: Christian Brauner <brauner@kernel.org>
-rw-r--r--fs/jfs/namei.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index b29d68b5eec5..494b9f4043cf 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -876,7 +876,7 @@ static int jfs_symlink(struct mnt_idmap *idmap, struct inode *dip,
tid_t tid;
ino_t ino = 0;
struct component_name dname;
- int ssize; /* source pathname size */
+ u32 ssize; /* source pathname size */
struct btstack btstack;
struct inode *ip = d_inode(dentry);
s64 xlen = 0;
@@ -957,7 +957,7 @@ static int jfs_symlink(struct mnt_idmap *idmap, struct inode *dip,
if (ssize > sizeof (JFS_IP(ip)->i_inline))
JFS_IP(ip)->mode2 &= ~INLINEEA;
- jfs_info("jfs_symlink: fast symlink added ssize:%d name:%s ",
+ jfs_info("jfs_symlink: fast symlink added ssize:%u name:%s ",
ssize, name);
}
/*
@@ -987,7 +987,7 @@ static int jfs_symlink(struct mnt_idmap *idmap, struct inode *dip,
ip->i_size = ssize - 1;
while (ssize) {
/* This is kind of silly since PATH_MAX == 4K */
- int copy_size = min(ssize, PSIZE);
+ u32 copy_size = min_t(u32, ssize, PSIZE);
mp = get_metapage(ip, xaddr, PSIZE, 1);