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out-of-bounds issue in sys_fillrect() To: Gu Bowen Cc: linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, Lu Jialin References: <20251112073207.1731125-1-gubowen5@huawei.com> <148a116a-b893-4e91-8573-1eebc2bb5c0e@gmx.de> <224e4e5b-14ae-411c-ad6c-f73c3b946ff8@huawei.com> Content-Language: en-US From: Helge Deller Autocrypt: addr=deller@gmx.de; keydata= xsFNBF3Ia3MBEAD3nmWzMgQByYAWnb9cNqspnkb2GLVKzhoH2QD4eRpyDLA/3smlClbeKkWT HLnjgkbPFDmcmCz5V0Wv1mKYRClAHPCIBIJgyICqqUZo2qGmKstUx3pFAiztlXBANpRECgwJ r+8w6mkccOM9GhoPU0vMaD/UVJcJQzvrxVHO8EHS36aUkjKd6cOpdVbCt3qx8cEhCmaFEO6u CL+k5AZQoABbFQEBocZE1/lSYzaHkcHrjn4cQjc3CffXnUVYwlo8EYOtAHgMDC39s9a7S90L 69l6G73lYBD/Br5lnDPlG6dKfGFZZpQ1h8/x+Qz366Ojfq9MuuRJg7ZQpe6foiOtqwKym/zV dVvSdOOc5sHSpfwu5+BVAAyBd6hw4NddlAQUjHSRs3zJ9OfrEx2d3mIfXZ7+pMhZ7qX0Axlq Lq+B5cfLpzkPAgKn11tfXFxP+hcPHIts0bnDz4EEp+HraW+oRCH2m57Y9zhcJTOJaLw4YpTY GRUlF076vZ2Hz/xMEvIJddRGId7UXZgH9a32NDf+BUjWEZvFt1wFSW1r7zb7oGCwZMy2LI/G 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Can you try to reproduce >> with git head? >>=20 >=20 > fbdev has already been refactored by commit eabb03293087 ("fbdev: > Refactoring the fbcon packed pixel drawing routines") on v6.15-rc1, > so this issue no longer exists in the mainline version. Similar > question has occurred in the past: >=20 > https://syzkaller.appspot.com/bug?extid=3D66bde8e1e4161d4b2cca >=20 > After the refactoring patch was merged, this issue did not reappear, > but it still exists in the stable version. Backporting commit eabb03293087 to 6.6 seems unrealistic. So, maybe adding your patch to stable might make sense. + if (dst_offset < 0 || dst_offset >=3D p->fix.smem_len) { + pr_err("dst offset out of bound: dst_offset(%ld)", dst_offset); + return; I don't like the pr_err() in here. I do understand that you want to print that something wrong happened, but we are inside the console printing code= . I think we should just return in this case. With that change we might ask Greg if he accepts this small patch for stab= le-6.6... Helge