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image-fit: fit_check_format check for valid FDT

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fit_check_format() must check that the buffer contains a flattened device
tree before calling any device tree library functions.

Failure to do may cause segmentation faults.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2021-01-13 02:09:12 +01:00
parent 5dad05a0e6
commit ea1a9ec5f4
1 changed files with 6 additions and 0 deletions
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6
common/image-fit.c
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@ -1553,6 +1553,12 @@ int fit_image_check_comp(const void *fit, int noffset, uint8_t comp)
*/
int fit_check_format(const void *fit)
{
/* A FIT image must be a valid FDT */
if (fdt_check_header(fit)) {
debug("Wrong FIT format: not a flattened device tree\n");
return 0;
}
/* mandatory / node 'description' property */
if (fdt_getprop(fit, 0, FIT_DESC_PROP, NULL) == NULL) {
debug("Wrong FIT format: no description\n");