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media: v4l2loopback: fix for dereferenced error

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Found the code hasn't check whether some var is NULL before
using it in v4l2loopback. Fix those issues.

Change-Id: I559ed8c0978cf478ed713761b7bc7e3b21c09ff4
Signed-off-by: Lily Li <lali@codeaurora.org>
This commit is contained in:
Lily Li 2019-08-26 14:45:42 +08:00 • committed by Bo Fang
parent fbbb7d9af6
commit 4bbb2def1d
1 changed files with 4 additions and 3 deletions
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7
drivers/media/v4l2loopback-master/v4l2loopback.c
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@ -483,6 +483,8 @@ static ssize_t attr_store_format(struct device *cd,
struct v4l2_loopback_device *dev = v4l2loopback_cd2dev(cd);
int fps_num = 0, fps_den = 1;
if (!dev)
return -EINVAL;
/* only fps changing is supported */
if (sscanf(buf, "@%d/%d", &fps_num, &fps_den) > 0) {
struct v4l2_fract f = {
@ -490,7 +492,6 @@ static ssize_t attr_store_format(struct device *cd,
.denominator = fps_num
};
int err = 0;
err = set_timeperframe(dev, &f);
if (err < 0)
return err;
@ -671,7 +672,7 @@ static inline void unset_flags(struct v4l2l_buffer *buffer)
static void vidioc_fill_name(char *buf, int len, int nr)
{
if (card_label[nr] != NULL)
snprintf(buf, len, card_label[nr]);
snprintf(buf, len, "%s\n", card_label[nr]);
else
snprintf(buf, len, "Dummy video device (0x%04X)", nr);
}
@ -1909,7 +1910,7 @@ static int v4l2_loopback_mmap(struct file *file, struct vm_area_struct *vma)
page = (void *)vmalloc_to_page((void *)addr);
if (vm_insert_page(vma, start, page) < 0)
if (!page || vm_insert_page(vma, start, page) < 0)
return -EAGAIN;
start += PAGE_SIZE;