evie/android_kernel_oneplus_msm8998
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diag: Validate msg source length to prevent out of bound access

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Place check for mask size and validate source length against
sum of header length and mask size to prevent out of bound access.

Change-Id: I8ac089202b6e3007773b92be8cfdc52fcb30ec3c
Signed-off-by: Manoj Prabhu B <bmanoj@codeaurora.org>
This commit is contained in:
Manoj Prabhu B 2019-09-24 14:54:33 +05:30 • committed by Gerrit - the friendly Code Review server
parent a8e92fae3a
commit e935115d05
1 changed files with 2 additions and 1 deletions
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3
drivers/char/diag/diag_masks.c
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@ -901,7 +901,8 @@ static int diag_cmd_set_msg_mask(unsigned char *src_buf, int src_len,
goto end;
if (mask_size + write_len > dest_len)
mask_size = dest_len - write_len;
memcpy(dest_buf + write_len, src_buf + header_len, mask_size);
if (mask_size && src_len >= header_len + mask_size)
memcpy(dest_buf + write_len, src_buf + header_len, mask_size);
write_len += mask_size;
for (i = 0; i < NUM_PERIPHERALS; i++) {
if (!diag_check_update(i, pid))