Re: [PATCH v4] common: buffer access out-of-bounds

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

On 18.10.24 18:24, Abdelrahman Youssef via B4 Relay wrote:
> From: Abdelrahman Youssef <abdelrahmanyossef12@gmail.com>
> 
> in file_detect_type() to detect file of type socfpga_xload you need at least
> 68 bytes bytes, so we need to check if we have enough bufsize.
> So I moved it after checking if `bufsize >= 256`.
> 
> Signed-off-by: Abdelrahman Youssef <abdelrahmanyossef12@gmail.com>

Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>

> ---
> This patch is a replacement of the last one because there were some issues with it

As mentioned in the v3 feedback, it's customary to write a changelog here.

Cheers,
Ahmad

> ---
> To: Sascha Hauer <s.hauer@pengutronix.de>
> To: open list:BAREBOX <barebox@lists.infradead.org>
> Signed-off-by: Abdelrahman Youssef <abdelrahmanyossef12@gmail.com>
> ---
>  common/filetype.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/common/filetype.c b/common/filetype.c
> index 3690d4ae07..67ae4916d1 100644
> --- a/common/filetype.c
> +++ b/common/filetype.c
> @@ -374,9 +374,6 @@ enum filetype file_detect_type(const void *_buf, size_t bufsize)
>  	if (le32_to_cpu(buf[5]) == 0x504d5453)
>  		return filetype_mxs_bootstream;
>  
> -	if (buf[16] == 0x31305341)
> -		return filetype_socfpga_xload;
> -
>  	if (is_barebox_arm_head(_buf))
>  		return filetype_arm_barebox;
>  	if (buf[9] == 0x016f2818 || buf[9] == 0x18286f01)
> @@ -388,6 +385,9 @@ enum filetype file_detect_type(const void *_buf, size_t bufsize)
>  	if (bufsize < 256)
>  		return filetype_unknown;
>  
> +	if (buf[16] == 0x31305341)
> +		return filetype_socfpga_xload;
> +
>  	if (strncmp(buf8, "STM\x32", 4) == 0) {
>  		if (buf8[74] == 0x01) {
>  			switch(le32_to_cpu(buf[63])) {
> 
> ---
> base-commit: 9d47ff66c3892c5a6ddd4704993365a797fbeb68
> change-id: 20241018-overflow-dc42def7e4f6
> 
> Best regards,


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