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fs/squashfs: fix potential integer overflows

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The length of buffers used to read inode tables, directory tables, and
reading a file are calculated as: number of blocks * block size, and
such plain multiplication is prone to overflowing (thus unsafe).

Replace it by __builtin_mul_overflow, i.e. safe math.

Signed-off-by: Joao Marcos Costa <joaomarcos.costa@bootlin.com>
This commit is contained in:
Joao Marcos Costa 2025-02-19 11:16:33 +01:00 • committed by Tom Rini
parent 5061eab96a
commit 59fd62d71c
1 changed files with 15 additions and 3 deletions
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18
fs/squashfs/sqfs.c
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@ -719,6 +719,7 @@ static int sqfs_read_inode_table(unsigned char **inode_table)
u32 src_len, dest_offset = 0;
unsigned long dest_len = 0;
bool compressed;
size_t buf_size;
table_size = get_unaligned_le64(&sblk->directory_table_start) -
get_unaligned_le64(&sblk->inode_table_start);
@ -728,7 +729,10 @@ static int sqfs_read_inode_table(unsigned char **inode_table)
sblk->directory_table_start, &table_offset);
/* Allocate a proper sized buffer (itb) to store the inode table */
itb = malloc_cache_aligned(n_blks * ctxt.cur_dev->blksz);
if (__builtin_mul_overflow(n_blks, ctxt.cur_dev->blksz, &buf_size))
return -EINVAL;
itb = malloc_cache_aligned(buf_size);
if (!itb)
return -ENOMEM;
@ -806,6 +810,7 @@ static int sqfs_read_directory_table(unsigned char **dir_table, u32 **pos_list)
u32 src_len, dest_offset = 0;
unsigned long dest_len = 0;
bool compressed;
size_t buf_size;
*dir_table = NULL;
*pos_list = NULL;
@ -818,7 +823,10 @@ static int sqfs_read_directory_table(unsigned char **dir_table, u32 **pos_list)
sblk->fragment_table_start, &table_offset);
/* Allocate a proper sized buffer (dtb) to store the directory table */
dtb = malloc_cache_aligned(n_blks * ctxt.cur_dev->blksz);
if (__builtin_mul_overflow(n_blks, ctxt.cur_dev->blksz, &buf_size))
return -EINVAL;
dtb = malloc_cache_aligned(buf_size);
if (!dtb)
return -ENOMEM;
@ -1369,6 +1377,7 @@ static int sqfs_read_nest(const char *filename, void *buf, loff_t offset,
unsigned long dest_len;
struct fs_dirent *dent;
unsigned char *ipos;
size_t buf_size;
*actread = 0;
@ -1573,7 +1582,10 @@ static int sqfs_read_nest(const char *filename, void *buf, loff_t offset,
table_offset = frag_entry.start - (start * ctxt.cur_dev->blksz);
n_blks = DIV_ROUND_UP(table_size + table_offset, ctxt.cur_dev->blksz);
fragment = malloc_cache_aligned(n_blks * ctxt.cur_dev->blksz);
if (__builtin_mul_overflow(n_blks, ctxt.cur_dev->blksz, &buf_size))
return -EINVAL;
fragment = malloc_cache_aligned(buf_size);
if (!fragment) {
ret = -ENOMEM;