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Improve _accept length check (#9170)

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Hugo van Kemenade 2025-08-27 17:41:40 +03:00 committed by GitHub
commit bde90757fa
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4 changed files with 4 additions and 4 deletions
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2
src/PIL/FliImagePlugin.py
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@ -30,7 +30,7 @@ from ._util import DeferredError
def _accept(prefix: bytes) -> bool: def _accept(prefix: bytes) -> bool:
return ( return (
len(prefix) >= 6 len(prefix) >= 16
and i16(prefix, 4) in [0xAF11, 0xAF12] and i16(prefix, 4) in [0xAF11, 0xAF12]
and i16(prefix, 14) in [0, 3] # flags and i16(prefix, 14) in [0, 3] # flags
) )

2
src/PIL/GribStubImagePlugin.py
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@ -33,7 +33,7 @@ def register_handler(handler: ImageFile.StubHandler | None) -> None:
def _accept(prefix: bytes) -> bool: def _accept(prefix: bytes) -> bool:
return prefix.startswith(b"GRIB") and prefix[7] == 1 return len(prefix) >= 8 and prefix.startswith(b"GRIB") and prefix[7] == 1
class GribStubImageFile(ImageFile.StubImageFile): class GribStubImageFile(ImageFile.StubImageFile):

2
src/PIL/PcxImagePlugin.py
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@ -39,7 +39,7 @@ logger = logging.getLogger(__name__)
def _accept(prefix: bytes) -> bool: def _accept(prefix: bytes) -> bool:
return prefix[0] == 10 and prefix[1] in [0, 2, 3, 5] return len(prefix) >= 2 and prefix[0] == 10 and prefix[1] in [0, 2, 3, 5]
## ##

2
src/PIL/PpmImagePlugin.py
View File

@ -47,7 +47,7 @@ MODES = {
def _accept(prefix: bytes) -> bool: def _accept(prefix: bytes) -> bool:
return prefix.startswith(b"P") and prefix[1] in b"0123456fy" return len(prefix) >= 2 and prefix.startswith(b"P") and prefix[1] in b"0123456fy"
## ##