From: Hemant Agrawal <[email protected]>
In lsx_ccsr_map_region, PAGE_SIZE is defined as sysconf(_SC_PAGESIZE)
which may be negative on error. The value was used directly in size_t
comparisons and passed to mmap, causing an integer overflow (Coverity
CID 49765682).
Use sysconf() explicitly with a signed long, check for errors, and
compute map_len separately with unsigned arithmetic before passing to
mmap.
Coverity issue: 49765682
Fixes: f023d059769f ("net/dpaa2: support recycle loopback port")
Cc: [email protected]
Signed-off-by: Hemant Agrawal <[email protected]>
---
drivers/net/dpaa2/dpaa2_recycle.c | 21 +++++++++++++++------
1 file changed, 15 insertions(+), 6 deletions(-)
diff --git a/drivers/net/dpaa2/dpaa2_recycle.c
b/drivers/net/dpaa2/dpaa2_recycle.c
index f78d12362e..80c20272ce 100644
--- a/drivers/net/dpaa2/dpaa2_recycle.c
+++ b/drivers/net/dpaa2/dpaa2_recycle.c
@@ -176,6 +176,8 @@ static void *lsx_ccsr_map_region(uint64_t addr, size_t len)
void *tmp;
uint64_t start;
uint64_t offset;
+ long page_size;
+ size_t map_len;
fd = open("/dev/mem", O_RDWR);
if (fd < 0) {
@@ -183,20 +185,27 @@ static void *lsx_ccsr_map_region(uint64_t addr, size_t
len)
return NULL;
}
+ page_size = sysconf(_SC_PAGESIZE);
+ if (page_size <= 0) {
+ close(fd);
+ return NULL;
+ }
start = addr & PAGE_MASK;
offset = addr - start;
len = len & PAGE_MASK;
- if (len < (size_t)PAGE_SIZE)
- len = PAGE_SIZE;
- tmp = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, start);
+ map_len = len & ~(page_size - 1);
+ if (map_len < (size_t)page_size)
+ map_len = (size_t)page_size;
+
+ tmp = mmap(NULL, map_len, PROT_READ | PROT_WRITE, MAP_SHARED, fd,
start);
close(fd);
- if (tmp != MAP_FAILED)
- return (uint8_t *)tmp + offset;
- else
+ if (tmp == MAP_FAILED)
return NULL;
+
+ return (uint8_t *)tmp + offset;
}
static const uint8_t ls_sd1_prot_idx_map[] = {
--
2.43.0
