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drm/i915: fix size_t greater or equal to zero comparison

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Currently the check that the unsigned size_t variable i is >= 0
is always true because the unsigned variable will never be negative,
causing the loop to run forever.  Fix this by changing the
pre-decrement check to a zero check on i followed by a decrement of i.

Addresses-Coverity: ("Unsigned compared against 0")
Fixes: bfed6708d6 ("drm/i915: use vmap in shmem_pin_map")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20201002170354.94627-1-colin.king@canonical.com
(cherry picked from commit e70956a249)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Colin Ian King 2020-10-02 18:03:54 +01:00 committed by Rodrigo Vivi
parent 0fe8bf4d3e
commit 88c52d805e
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/gt/shmem_utils.c
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@ -73,7 +73,7 @@ void *shmem_pin_map(struct file *file)
mapping_set_unevictable(file->f_mapping);
return vaddr;
err_page:
while (--i >= 0)
while (i--)
put_page(pages[i]);
kvfree(pages);
return NULL;