[PATCH][next] drm/i915: fix size_t greater or equal to zero comparison

[PATCH][next] drm/i915: fix size_t greater or equal to zero comparison

[Colin King]

From: Colin Ian King <colin.king@canonical.com>

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: 400b65cb5acb ("drm/i915: use vmap in shmem_pin_map")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/gpu/drm/i915/gt/shmem_utils.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/shmem_utils.c b/drivers/gpu/drm/i915/gt/shmem_utils.c
index f011ea42487e..30cc56fa191f 100644
--- a/drivers/gpu/drm/i915/gt/shmem_utils.c
+++ b/drivers/gpu/drm/i915/gt/shmem_utils.c
@@ -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;
-- 
2.27.0

[PATCH][next] drm/i915: fix size_t greater or equal to zero comparison

[Colin King]

From: Colin Ian King <colin.king@canonical.com>

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: 400b65cb5acb ("drm/i915: use vmap in shmem_pin_map")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/gpu/drm/i915/gt/shmem_utils.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/shmem_utils.c b/drivers/gpu/drm/i915/gt/shmem_utils.c
index f011ea42487e..30cc56fa191f 100644
--- a/drivers/gpu/drm/i915/gt/shmem_utils.c
+++ b/drivers/gpu/drm/i915/gt/shmem_utils.c
@@ -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;
-- 
2.27.0

[PATCH][next] drm/i915: fix size_t greater or equal to zero comparison

[Colin King]

From: Colin Ian King <colin.king@canonical.com>

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: 400b65cb5acb ("drm/i915: use vmap in shmem_pin_map")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/gpu/drm/i915/gt/shmem_utils.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/shmem_utils.c b/drivers/gpu/drm/i915/gt/shmem_utils.c
index f011ea42487e..30cc56fa191f 100644
--- a/drivers/gpu/drm/i915/gt/shmem_utils.c
+++ b/drivers/gpu/drm/i915/gt/shmem_utils.c
@@ -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;
-- 
2.27.0

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[Intel-gfx] [PATCH][next] drm/i915: fix size_t greater or equal to zero comparison

[Colin King]

From: Colin Ian King <colin.king@canonical.com>

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: 400b65cb5acb ("drm/i915: use vmap in shmem_pin_map")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/gpu/drm/i915/gt/shmem_utils.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/shmem_utils.c b/drivers/gpu/drm/i915/gt/shmem_utils.c
index f011ea42487e..30cc56fa191f 100644
--- a/drivers/gpu/drm/i915/gt/shmem_utils.c
+++ b/drivers/gpu/drm/i915/gt/shmem_utils.c
@@ -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;
-- 
2.27.0

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[Intel-gfx] ✗ Fi.CI.BUILD: failure for drm/i915: fix size_t greater or equal to zero comparison

[Patchwork]

== Series Details ==

Series: drm/i915: fix size_t greater or equal to zero comparison
URL   : https://patchwork.freedesktop.org/series/82342/
State : failure

== Summary ==

Applying: drm/i915: fix size_t greater or equal to zero comparison
Using index info to reconstruct a base tree...
M	drivers/gpu/drm/i915/gt/shmem_utils.c
Falling back to patching base and 3-way merge...
Auto-merging drivers/gpu/drm/i915/gt/shmem_utils.c
CONFLICT (content): Merge conflict in drivers/gpu/drm/i915/gt/shmem_utils.c
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 drm/i915: fix size_t greater or equal to zero comparison
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".


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