Franco Venturi cf85cd84aa mmc: fix signed vs unsigned compare in read check in _spl_load()
Fix signed vs unsigned compare in read check in _spl_load()

Issue: when info->read() returns a negative value because of an error,
       the comparison of 'read' (signed) with 'sizeof(*header)'
       (unsigned silently converts the negative value into a very
       large unsigned value and the check on the error condition
       always return false, i.e. the error is not detected
Symptoms: if spl_load_image_fat() is unable to find the file 'uImage',
          the SPL phase of the boot process just hangs after displaying
          the following line:
          Trying to boot from MMC1
Fix: cast 'sizeof(*header)' to int so the compare is now between
     signed types
Reference: https://stackoverflow.com/questions/17293749/sizeof-operator-in-if-statement

Signed-off-by: Franco Venturi <fventuri@comcast.net>
Reviewed-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
2024-08-27 18:04:05 -06:00
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