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accel/ivpu: prevent uninitialized data bug in debugfs

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The simple_write_to_buffer() will only initialize data starting from
the *pos offset so if it's non-zero then the first part of the buffer
uninitialized.  Really, if *pos is non-zero then this code won't work
so just check for that at the start of the function.

Fixes: 320323d2e5 ("accel/ivpu: Add debugfs interface for setting HWS priority bands")
Signed-off-by: Dan Carpenter <error27@gmail.com>
Reviewed-by: Karol Wachowski <karol.wachowski@linux.intel.com>
Signed-off-by: Karol Wachowski <karol.wachowski@linux.intel.com>
Link: https://patch.msgid.link/ahP24m6Mii9EDL7Q@stanley.mountain
This commit is contained in:
Dan Carpenter 2026-05-25 10:14:42 +03:00 committed by Karol Wachowski
parent 7f87763f47
commit 44e151be23
1 changed files with 1 additions and 1 deletions
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2
drivers/accel/ivpu/ivpu_debugfs.c
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@ -450,7 +450,7 @@ priority_bands_fops_write(struct file *file, const char __user *user_buf, size_t
u32 band;
int ret;
if (size >= sizeof(buf))
if (*pos != 0 || size >= sizeof(buf))
return -EINVAL;
ret = simple_write_to_buffer(buf, sizeof(buf) - 1, pos, user_buf, size);